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| Preparation and Exploration of Catalytic Activity of Pr1-x(La0.37Ce0.63)xCoO3 |
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Received:February 20, 2019
Revised:February 26, 2019
Accepted:February 27, 2019
Published Online:April 16, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.05.014 |
| KeyWord:sol-gel method; Pr1-x(La0.37Ce0.63)xCoO3 powder; preparation; catalytic activity |
| Author | Institution |
| Xu lincheng |
包头师范学院 化学学院 |
| Hao ZhanZhong |
包头师范学院 化学学院 |
| Li Fan |
北京工业大学 环境与能源工程学院 |
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| Abstract: |
| Pr1-x(La0.37Ce0.63)xCoO3 was prepared by sol-gel method. Decomposition characteristics of dry gel precursors were investigated by TG-DSC and changes of chemical bonds of heat treatment were analyzed by FT-IR. Microstructure, morphology and element distribution of prepared powders were determined by XRD and SEM-EDS. Electro-catalytic activity of powders for oxygen reduction reaction ORR in alkali solution were investigated by CV, LSV and RRDE techniques. The results show that when calcined at 700 ℃, x<0.4, impurity of La2O3 and CeO2 appear, perovskite crystal structures disappear when x>0.4, and pure phase powder is porous when x=0.4. Mass activity (current density) of Pr1-x(La0.37Ce0.63)xCoO3 powder is 172.54 mA/mg, 1.7 times higher than that of commercial Pt/C, but half-wave potential is only 0.60 V (vs. RHE). It is a two-electron process in oxygen reduction reaction, and yield of by-product H2O2 is 77%. It can be further enhanced as catalyst material. |
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